chore: Bump "postcss" package version to 8.5.4 (#2215)

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package-lock.json

@@ -59,7 +59,7 @@
     "lazysizes": "^5.3.2",
     "markdownlint-cli2": "^0.10.0",
     "netlify-plugin-submit-sitemap": "^0.4.0",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.4",
     "postcss-cli": "^10.1.0",
     "purgecss-whitelister": "^2.4.0",
     "shx": "^0.3.4",